Data cartridge backup unit



FIG. 1 is a top, front, left side perspective view of a data cartridge backup unit showing our new design;

FIG. 2 is a front elevational view thereof on a reduced scale;

FIG. 3 is a left side elevational view thereof, on a reduced scale, the opposite side being identical;

FIG. 4 is a rear elevational view thereof on a reduced scale;

FIG. 5 is a top plan view thereof on a reduced scale;

FIG. 6 is a bottom plan view thereof on a reduced scale. 

The ornamental design for a data cartridge backup unit, as shown and described. 